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A089873
Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A071665/A071666.
0
1, 1, 2, 2, 2, 4, 4, 4, 10, 6, 10, 12, 16, 20, 36, 28, 56, 46, 104, 84, 166
OFFSET
0,3
COMMENTS
The number of n-node binary trees fixed by the corresponding automorphism(s).
CROSSREFS
Sequence in context: A112801 A344853 A173862 * A275433 A096323 A282562
KEYWORD
nonn
AUTHOR
Antti Karttunen, Nov 29 2003
STATUS
approved